CODEWITHSUNDEEP
java
karuppasamy
karuppasamy

Reputation: 11

Sortbyname cannot be resolved to a type in java

Error:

Sortbyname cannot be resolved to a type in java

I am using the Comparator interface method by sorting the name and score for cricket players using in java.

I am a beginner in java

package javapractice2;
import java.util.*;
import java.io.*;
public class Player {
    String player_name;
    int player_score;

    public Player(String member, int score) {
        this.player_name = member;
        this.player_score = score;
    }
}

/Comparator/

package javapractice2;
import java.util.*;
public class NameComparator {

    public class Sortbyname implements Comparator<Player>{

        public int compare(Player a, Player b){

            return a.player_name.compareTo(b.player_name);

        }
    }

}

/Main method in java/

package javapractice2;

import java.util.ArrayList;

import java.util.Collections;

public class Mainclass {

    public static void main(String[] args) {         

        ArrayList<Player> ply = new ArrayList<Player>();

        ply.add(new Player ("kuldeep", 85));
        ply.add(new Player ("jadeja", 75));
        ply.add(new Player ("dohni", 48));
        ply.add(new Player ("kozhi", 78));
        ply.add(new Player ("raina", 48));
        ply.add(new Player ("sachin", 85));
        ply.add(new Player ("yuvaraj", 100));
        ply.add(new Player ("Ajinkya", 85));
        ply.add(new Player ("baji", 75));
        ply.add(new Player ("hardik", 55));

        Collections.sort(ply, new Sortbyname());

        for(int i=0; i<ply.size(); i++){
            System.out.println(ply.get(i));
        }


    }
}

Upvotes: 0

Views: 631

Answers (2)

Chandan D N
Chandan D N

Reputation: 335

Sortbyname is a nested class,

you need to create object for it as bellow,

new NameComparator.new Sortbyname();

go through below link for more information https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html

Upvotes: 1

Amitabha Roy
Amitabha Roy

Reputation: 797

Everything in your code is fine except the following inner class style code:

public class NameComparator {

public class Sortbyname implements Comparator<Player>{

So change this class as following:

Sortbyname.java

package javapractice2;

import java.util.Comparator;

public class Sortbyname implements Comparator<Player> {

    public int compare(Player a, Player b) {
        return a.player_name.compareTo(b.player_name);
    }
}

Also add a toString() method in Player.java for better output printing:

package javapractice2;

public class Player {
    String player_name;
    int player_score;

    public Player(String member, int score) {
        this.player_name = member;
        this.player_score = score;
    }

    @Override
    public String toString() {
        return "Player [player_name=" + player_name + ", player_score=" + player_score + "]";
    }

}

Otherwise, if you want to keep your code, then update the following in your Mainclass.java:

Collections.sort(ply, new NameComparator().new Sortbyname());

Upvotes: 2

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